Scilab function
Last update : September 1996

delete_arcs - deletes all the arcs or edges between a set of nodes

### Calling Sequence

  `g1 = delete_arcs(ij,g)`

### Parameters

- `ij`: matrix of integers (number of nodes)
- `g`: graph list
- `g1`: graph list of the new graph without the arcs or edges defined by ij

### Description

If `g` is a directed graph, `delete_arcs` returns the graph `g1` with the arcs defined by matrix `ij` being deleted. `ij` must be a n x 2 matrix of node numbers: the n arcs to be deleted are defined by couples of nodes (`ij(i,1)`, `ij(i,2)`).

If `g` is an undirected graph, the edges corresponding to matrix `ij` are deleted.

### Examples

    ta=[1 1 2 2 2 3 4 5 5 7 8 8 9 10 10 10 10 10 11 12 13 13 13 14 15 16 16 17 17];
    he=[2 10 3 5 7 4 2 4 6 8 6 9 7 7 11 13 13 15 12 13 9 10 14 11 16 1 17 14 15];
    g=make_graph('foo',1,17,ta,he);
    g('node_x')=[283 163 63 57 164 164 273 271 339 384 504 513 439 623 631 757 642];
    g('node_y')=[59 133 223 318 227 319 221 324 432 141 209 319 428 443 187 151 301];
    show_graph(g);
    ij=[13 10;8 6;5 4;4 2];
    gt=delete_arcs(ij,g);
    show_graph(gt,'new');
    g('directed')=0;
    gt=delete_arcs(ij,g);
    show_graph(gt,'new');

### See Also

`add_edge`, `add_node`, `delete_nodes`,